Even if your are not planning to advertise with Google Adwords, Google Adwords is an excellent tool to master. You can use it to test your startup product or idea before building it. That’s the smart way to go – get as much market validation as you can before building your product, not after.

This is an excellent introduction to the Lean Startup methodology, available as a free course from Udemy. It’s also a great introduction to the startup world if this is new to you. Highly recommended for all bootstrapping startup-preneurs.

Copywriting is an essential skill for bootstrapping startup founders. Luckily there’s a ton of free learning resources out there. It’s not hard to learn and get up to speed on. Copyblogger’s Copywriting 101 is a great place to start.

If you are serious about founding your startup, learning HTML and CSS first should be high on your “Founder literacy” agenda. They are both invaluable skills and both are very easily to learn. You can get up to speed in a couple of hours!